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JuliaFEM.jl - an open source solver for both industrial and academia usage

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Everything is outdated. See other FEM options from here: https://github.com/JuliaPDE/SurveyofPDEPackages?tab=readme-ov-file#fem


JuliaFEM organization web-page: http://www.juliafem.org

The JuliaFEM project develops open-source software for reliable, scalable, distributed Finite Element Method.

The JuliaFEM software library is a framework that allows for the distributed processing of large Finite Element Models across clusters of computers using simple programming models. It is designed to scale up from single servers to thousands of machines, each offering local computation and storage. The basic design principle is: everything is nonlinear. All physics models are nonlinear from which the linearization are made as a special cases.

At the moment, users can perform the following analyses with JuliaFEM: elasticity, thermal, eigenvalue, contact mechanics, and quasi-static solutions. Typical examples in industrial applications include non-linear solid mechanics, contact mechanics, finite strains, and fluid structure interaction problems. For visualization, JuliaFEM uses ParaView which prefers XDMF file format using XML to store light data and HDF to store large data-sets, which is more or less the open-source standard.

Vision

On one hand, the vision of the JuliaFEM includes the opportunity for massive parallelization using multiple computers with MPI and threading as well as cloud computing resources in Amazon, Azure and Google Cloud services together with a company internal server. And on the other hand, the real application complexity including the simulation model complexity as well as geometric complexity. Not to forget that the reuse of the existing material models as well as the whole simulation models are considered crucial features of the JuliaFEM package.

Recreating the wheel again is definitely not anybody's goal, and thus we try to use and embrace good practices and formats as much as possible. We have implemented Abaqus / CalculiX input-file format support and maybe will in the future extend to other FEM solver formats. Using modern development environments encourages the user towards fast development time and high productivity. For developing and creating new ideas and tutorials, we have used Jupyter notebooks to make easy-to-use handouts.

The user interface for JuliaFEM is Jupyter Notebook, and Julia language itself is a real programming language. This makes it possible to use JuliaFEM as a part of a bigger solution cycle, including for example data mining, automatic geometry modifications, mesh generation, solution, and post-processing and enabling efficient optimization loops.

Installing JuliaFEM

Inside Julia REPL, type:

Pkg.add("JuliaFEM")

Initial road map

JuliaFEM current status: project planning

Version Number of degree of freedom Number of cores
0.1.0 1 000 000 10
0.2.0 10 000 000 100
1.0.0 100 000 000 1 000
2.0.0 1 000 000 000 10 000
3.0.0 10 000 000 000 100 000

We strongly believe in the test driven development as well as building on top of previous work. Thus all the new code in this project should be 100% tested. Also other people have wisdom in style as well:

The Zen of Python:

Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Errors should never pass silently.

Citing

If you like using our package, please consider citing our article

@article{frondelius2017juliafem,
  title={Julia{FEM} - open source solver for both industrial and academia usage},
  volume={50}, 
  url={https://rakenteidenmekaniikka.journal.fi/article/view/64224},
  DOI={10.23998/rm.64224},
  number={3},
  journal={Rakenteiden Mekaniikka},
  author={Frondelius, Tero and Aho, Jukka},
  year={2017},
  pages={229-233}
}

Contributing

Developing JuliaFEM encourages good practices, starting from unit testing both for smaller and larger functions and continuing to full integration testing of different platforms.

Interested in participating? Please start by reading contributing.

umat.jl's People

Contributors

ahojukka5 avatar github-actions[bot] avatar jvaara avatar terofrondelius avatar

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umat.jl's Issues

Miss match in PlasticIteration signature

Dear @jvaara, maybe it wasn't the last working version of the code you uploaded. I found a miss match in PlasticIteration signature. umat_models/gurson_porous_plasticity.f90 (or actually gfortran found)

 360: subroutine PlasticIteration(f,ep,DEp,DEq,DDSDDE,STRIAL,X,epn,fnn,MAXITERS,TOL,PROPS,NPROPS,NTENS,NDI,res,DISP)
1198:       call PlasticIteration(f,ep,DEp,DEq,DDSDDE,STRIAL,X,MAXITERS,TOL,PROPS,NPROPS,NTENS,NDI,res,DISP-1)

UMAT Utilities

Someone else proposed this earlier, I couldn't find it. Anyway, I found the list of UMAT Utilities:
– SINV will return the first and second invariants of a tensor.
– SPRINC will return the principal values of a tensor.
– SPRIND will return the principal values and directions of a tensor.
– ROTSIG will rotate a tensor with an orientation matrix.
– XIT will terminate an analysis and close all files associated with the analysis properly.

If we want to have full compatibility we will eventually need to support these Fortran subroutines.

Also #6 is a same thing.

Install Error

I cannot install UMAT.Jl in Julia 1.2.0

ERROR: Unsatisfiable requirements detected for package BinaryProvider [b99e7846]:
 BinaryProvider [b99e7846] log:
 ├─possible versions are: 0.5.3 or uninstalled
 └─restricted to versions 0.5.6-0.5 by UMAT [d4351ba0] — no versions left
   └─UMAT [d4351ba0] log:
     ├─possible versions are: 0.1.0 or uninstalled
     └─UMAT [d4351ba0] is fixed to version 0.1.0

Bigger strain values GursonMaterial model crashes

There is a possible bug in the Gurson Fortran UMAT (or somewhere in the UMAT.jl), which causes Julia to crash on the Windows machine. This error that I happened to get might be related:

(UMAT) pkg> test UMAT
   Testing UMAT
 Resolving package versions...
 ** On entry to DGESV   parameter number  4 had an illegal value
ERROR: Package UMAT errored during testing

CC @jvaara

Strings Utility Module

Dear all,

we may include "Strings Utility Module" for gurson_porous_plasticity.f90?

Warm regards.

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